Building an Atom Simulation

What happens when you add a proton?
When ever you add a proton the atom stabilizes.
What does it mean when an atom is stable? What does it mean when an atom is unstable? IF the atom is stable then it means that it has enough energy to hold the nucleus together. If and atom is unstable then the energy in the atom is not strong enough to hold it together and the nuclei of the atoms are unstable. If and atom is unstable it will automatically lost neutrons and protons in the midst of trying to be stable.
How do you make an atom stable? What do you need to do?
If you want to make an atom stable then all you need to do is add the correct amount of protons.
What is the valence electron pattern as you move across the periodic table?
Valence elections are the electrons that are in the last shell (energy level) of an atom. They have a periodic pattern which is that the valence electrons will increase in the number as you go across a row. When you start a new row the number will drop back down and then begin to increase again.

What happens to the atom when there is more protons, more neutrons, or more electrons?
It becomes unstable.

What's the difference between a positive and a negative ion?
An ion is when an atom loses/gains an electron. So, when an atom loses an electron it becomes positivetly charged because o the number of protons in the atom are greater than the electrons in the atom. However, when an atom gains an electron it becomes a negative ion, because this time the number of electrons is great than the number of protons.